#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

  int main() {
  int t = 0;
    while (scanf("%d", &t) != EOF)
    {
        if (t > 0)
        {
            printf("1\n");
        }
        else if (t == 0)
        {
            printf("0.5\n");
        }
        else
        {
            printf("0\n");
        }
    }
    return 0;
}